Question

___ are small, saccular outpocketings off of the ____, alveolar ducts and alveolar sacs. ___ are the functional unit of the lung

Answer 1

An alveolar sac is a cluster of many individual alveoli responsible for gas exchange. Alveoli are connected to their neighbors by alveolar pores.

Step-by-step explanation:

An alveolar sac is a cluster of many individual alveoli that are responsible for gas exchange. An alveolus is approximately 200 µm in diameter with elastic walls that allow the alveolus to stretch during air intake, which greatly increases the surface area available for gas exchange. Alveoli are connected to their neighbors by alveolar pores, which help maintain equal air pressure throughout the alveoli and lung.